He's never said I love you. Been together for a year?

My boyfriend isnt much for lovey dovey stuff. I never really thought it mattered but it hurts every time I say I love you to him he says thanks. I've asked if he even loves me and he said he doesn't know he won't tell me until he knows. My girlfriends think it's weird and it'd not normal. What do you think and if you were me what would you do?